80799809 has 2 divisors, whose sum is σ = 80799810. Its totient is φ = 80799808.

The previous prime is 80799791. The next prime is 80799833. The reversal of 80799809 is 90899708.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42706225 + 38093584 = 6535^2 + 6172^2 .

It is a cyclic number.

It is not a de Polignac number, because 80799809 - 2⁸ = 80799553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80799409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40399904 + 40399905.

It is an arithmetic number, because the mean of its divisors is an integer number (40399905).

Almost surely, 2^80799809 is an apocalyptic number.

It is an amenable number.

80799809 is a deficient number, since it is larger than the sum of its proper divisors (1).

80799809 is an equidigital number, since it uses as much as digits as its factorization.

80799809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 80799809 is about 8988.8713974559. The cubic root of 80799809 is about 432.3181259418.

The spelling of 80799809 in words is "eighty million, seven hundred ninety-nine thousand, eight hundred nine".